31442021 has 8 divisors (see below), whose sum is σ = 33967584. Its totient is φ = 28931760.

The previous prime is 31441999. The next prime is 31442069. The reversal of 31442021 is 12024413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31442021 - 2¹⁸ = 31179877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31442821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 650 + ... + 7956.

It is an arithmetic number, because the mean of its divisors is an integer number (4245948).

Almost surely, 2^31442021 is an apocalyptic number.

It is an amenable number.

31442021 is a deficient number, since it is larger than the sum of its proper divisors (2525563).

31442021 is a wasteful number, since it uses less digits than its factorization.

31442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7651.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 31442021 is about 5607.3185213612. The cubic root of 31442021 is about 315.6240956874.

Adding to 31442021 its reverse (12024413), we get a palindrome (43466434).

The spelling of 31442021 in words is "thirty-one million, four hundred forty-two thousand, twenty-one".